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In communications, a system is wideband when the message bandwidth significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth; other links may have relatively low data rates, but deliberately use a wider bandwidth than "necessary" for that data rate in order to gain other advantages; see spread spectrum.

A wideband antenna is one with approximately or exactly the same operating characteristics over a very wide passband.[1] It is distinguished from broadband antennas, where the passband is large, but the antenna gain and/or radiation pattern need not stay the same over the passband.

The term Wideband Audio or (also termed HD Voice or Wideband Voice) denotes a telephony using a wideband codec, which uses a greater frequency range of the audio spectrum than conventional voiceband telephone calls, resulting in a clearer sound. Wideband in this context is usually considered to cover frequencies in the range of 50–7,000 Hz, therefore allowing audio with richer tones and better quality.[2]

According to the United States Patent and Trademark Office, WIDEBAND is a registered trademark of WideBand Corporation, a USA-based manufacturer of Gigabit Ethernet equipment.[3][4]

In some contexts wideband is distinguished from broadband in being broader.[5]

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  1. ^ A. Moradikordalivand and T. A. Rahman, "Broadband modified rectangular microstrip patch antenna using stepped cut at four corners method", Progress In Electromagnetics Research, Vol. 137, 599-619, 2013 |url=http://www.jpier.org/pier/pier.php?paper=13011714%7C
  2. ^ "Unified Communications Architecture Basics". Cisco Systems. Retrieved 2012-11-09. 
  3. ^ "US Trademark Search". United States Patent and Trademark Office. Retrieved 2008-10-08. 
  4. ^ "WideBand Corporation web site". WideBand Corporation. Retrieved 2009-03-04. 
  5. ^ Forester research Shift from broadband to wideband